This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A144766 #20 Feb 27 2020 20:40:50 %S A144766 121,10001,10201,36763,1226221,7673767,12467976421,1030507050301, %T A144766 1120237320211,1225559555221,1234469644321,1334459544331, %U A144766 100330272033001,100827848728001,101222252222101,103023070320301,121363494363121,134312696213431,10022212521222001 %N A144766 Terms in A144719 that are themselves decimal palindromes. %C A144766 Presumed infinite, but it is difficult to find more terms. %C A144766 The earlier claim that this sequence is a subsequence of A046450 was incorrect, as the counterexample of 7673767 =97*79111 shows. The reason is that A046450 checks only concatenations in the natural order of the prime factors, but this sequence here allows for both orders, 97//79111 as well as 79111//97, to be palindromic. - _R. J. Mathar_, Jan 22 2009 %C A144766 3*10^14 < a(19) <= 10022212521222001. - _Donovan Johnson_, Dec 08 2010 %H A144766 Giovanni Resta, <a href="/A144766/b144766.txt">Table of n, a(n) for n = 1..41</a> %F A144766 Subsequence of (A144719 INTERSECT A046328). - _R. J. Mathar_, Jan 22 2009 %e A144766 10001 = 73 * 137; 73137 is a palindrome. %Y A144766 Cf. A002113, A046450, A144719. %K A144766 base,hard,nonn %O A144766 1,1 %A A144766 _Reikku Kulon_, Sep 20 2008 %E A144766 a(7)-a(18) from _Donovan Johnson_, Dec 08 2010 %E A144766 a(19) from _Giovanni Resta_, Aug 31 2018